CN107641685B - A kind of heat treatment method of high-strength steel sheet - Google Patents
A kind of heat treatment method of high-strength steel sheet Download PDFInfo
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- CN107641685B CN107641685B CN201710954779.4A CN201710954779A CN107641685B CN 107641685 B CN107641685 B CN 107641685B CN 201710954779 A CN201710954779 A CN 201710954779A CN 107641685 B CN107641685 B CN 107641685B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000000137 annealing Methods 0.000 claims abstract description 22
- 238000005098 hot rolling Methods 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000007747 plating Methods 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 238000010583 slow cooling Methods 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 9
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 238000005261 decarburization Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 238000005275 alloying Methods 0.000 abstract description 7
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- 230000008859 change Effects 0.000 abstract description 6
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- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 2
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- 229910052719 titanium Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
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- 229910052720 vanadium Inorganic materials 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
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- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of heat treatment methods of high-strength steel sheet, by to continuous annealing in high-strength steel sheet heat treatment method, zinc-plated, melting, hot rolling and etc. optimization and steel plate alloying component adjustment, the crystal structure of alloy is set to change, the refinement for strengthening texture and recrystallized structure, to significantly improve the mechanical performance of steel plate.The parameter of each process section of continuous annealing is finely controlled, and nanometer reinforcing phase is added in zinc-plated step, optimizes plating solution composition, surface of steel plate performance is made to be further improved.
Description
Technical field
The present invention relates to steel plate manufacture fields, in particular to a kind of heat treatment method of high-strength steel sheet.
Background technique
High-strength steel sheet is a kind of material indispensable in modern automobile industry.Currently, high Strength Steel for Motor Vehicles
Research is concentrated mainly on the process optimization of microstructure mechanical property and rolling, heat treatment and welding.For example, high strength steel
The microstructure variation of plate welding point, rolling mill practice influence rule to the microstructure characteristic of CSP line hot-rolled high-strength steel plate
The new technique etc. of rule and advanced short route-deep processing, is the research hotspot of current high-strength steel sheet.But with automobile
The acceleration of lightweight process, high-strength steel sheet must be adjusted its ingredient, processing technology, to adapt to automobile market to light weight
Change the demand of component, corrosion resistance preferable steel plate smaller with respect to specific gravity is obtained, to effectively facilitate automotive light weight technology.Alloy
The addition of element is to improve the effective way of metal material performance, and different R & D Enterprises in high-strength steel sheet to being added to not
It is right for studying influence of the various elements to pattern material with high strength tensile property and thermal fatigue property with the alloying element of content
The alloying element content of high-strength steel sheet optimizes.
Currently, high-strength steel sheet has technical problem to be solved, in addition to better performance, lower production cost,
Except the individual character and specific use of steel grade, the optimized production process that focuses on that should especially pay close attention to makes the further fine grain of steel plate
Change, organizational controls refine, are cost effective, further increase the processability of plate, improve intensity and loss of weight energy conservation, optimize table
Surface treatment is guaranteeing performance and the constant situation of technological level to eliminate defect and improve anti-corrosion ability, paintability and appearance etc.
More durable service life can be obtained down.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of heat treatment method of high-strength steel sheet, at the heat
Reason method can obtain crystal grain refinement and have high-intensitive and excellent surface performance high-strength steel sheet.It is specific as follows:
A kind of heat treatment method of high-strength steel sheet, which is characterized in that the yield strength of the high-strength steel sheet is 1300
~1500MPa, tensile strength are 1600~1800 MPa；The heat treatment method includes continuous annealing and zinc-plated step；Wherein,
The process section successively carried out when the continuous annealing includes: one section of heating, soaking zone, slow cooling section, two sections of heating, soaking zone, fast
Cold section and overaging section；
Each process section control parameter includes: one section 750~850 DEG C of heating, 10~15 DEG C/s of heating speed；Soaking zone
800~900 DEG C, 300~500s of soaking time；450~550 DEG C of slow cooling section outlet temperature, slow cooling section cooling velocity is 5~10
℃/s；Two sections 650~750 DEG C of heating, 10~15 DEG C/s of heating speed；700~800 DEG C of soaking zone, soaking time 200~
400s；100~200 DEG C of rapid cooling section outlet temperature, 50~100 DEG C/s of rapid cooling section cooling velocity；350~400 DEG C of overaging section；
When described zinc-plated, cathode-current density be 5~10A/dm, temperature be 30~50 DEG C, mixing speed be 200~
400r/min contains 10~15g/L of ZnO in plating solution, and 100~120g/L of NaOH and nano SiC granule are as reinforced phase.
By weight percentage, elemental composition includes: C≤0.005% to the high-strength steel sheet, and Si:0.20~
0.35%, Mn:0.20~0.35%, Al:1.40~1.60%, Cr:0.10~0.50%, Ce:0.05~0.10%, P≤
0.010%, S≤0.010%, surplus are Fe and inevitable impurity.
Preferably, the high-strength steel sheet by weight percentage, elemental composition further include: Ti:0.10~0.50%
And/or Zr:0.10~0.50% and/or V:0.10~0.50% and/or Nb:0.10~0.50%,
Preferably, in the course of hot rolling carried out before the heat treatment, first heating steel billet is kept the temperature to 1200~1250 DEG C
1h, hot rolling start rolling temperature is 1150 DEG C, and with a thickness of 5mm after 6 passes, finishing temperature is 900 DEG C or more, 700 DEG C with
Upper curling, then pickling.
Preferably, in the smelting process carried out before the hot rolling, molten iron is first passed through into pre- desulfurization, pre- dephosphorization, pre- decarburization
Pretreatment, cooperates RH application of vacuum in converter smelting.
Preferably, the average grain diameter of the nano SiC granule is about 50nm.
The invention has the advantages that by continuous annealing, zinc-plated, melting, hot rolling etc. in high-strength steel sheet heat treatment method
The optimization of step and the adjustment of steel plate alloying component, make the crystal structure of alloy change, and strengthen texture and recrystallized structure
Refinement, to significantly improve the mechanical performance of steel plate.The parameter of each process section of continuous annealing is finely controlled, and
Nanometer reinforcing phase is added in zinc-plated step, optimizes plating solution composition, surface of steel plate performance is made to be further improved.
Specific embodiment
Heat treatment process has an important influence the microstructure of steel plate.{ 111 } annealing texture is stronger in light sheet,
{ 100 } texture is weaker, and the stamping formabilily of steel plate is better.When cold rolling reduction ratio is greater than 70%, shared by cold rolling gamma fiber texture
Ratio reaches maximum value.Due to different annealing way treated deformation storage can difference, the influence to texture also has difference.
When rapid temperature annealing, recrystal grain forming core directly on Zona transformans, orientation is consistent with deformed matrix, and Recrystallization nucleation is grown up
Mode is that subgrain merges forming core.At a slow speed when heating annealing, recrystal grain forming core hair in cold rolling fibr tissue grain boundaries, orientation with
Deformed matrix is not necessarily consistent, Recrystallization nucleation grow up mode be crystal boundary bend forming core out.
In terms of element composition, suitable alloying element is added in high-strength steel sheet, facilitates the drawing for improving Automobile Plate
Stretch performance and fatigue behaviour.For example, alloying element Ti, Zr, V, Nb etc. is added, compared with not adding above-mentioned element, height can be made
The tensile strength of strength steel sheet increases 10% ~ 16%, yield strength and increases 20 ~ 30%, and elongation after fracture is held essentially constant.?
Under continuous annealing process, after adding trace rare-earth element, the generation of the microstructure of steel plate will be significantly affected, structural transformation
Speed and behavior are suppressed, and material softening behavior is postponed, and this is mainly due to rare earth elements in steel to exist in grain boundaries, resistance
Hinder the movement of dislocation and the migration of crystal boundary, and then inhibits the growth process of Recrystallization nucleation and core, while rare earth element can be promoted
Recrystallization nucleation activation energy, therefore its subgrain nucleation process quickly carried out is suppressed, recrystallization behavior is postponed.
Below with reference to embodiment and comparative example, the present invention is described in more detail.
Embodiment 1:
A kind of heat treatment method of high-strength steel sheet, which is characterized in that the yield strength of the high-strength steel sheet is
1300MPa, tensile strength 1600MPa；The heat treatment method includes continuous annealing and zinc-plated step.Wherein, described continuous
The process section successively carried out when annealing includes: one section of heating, soaking zone, slow cooling section, two sections of heating, soaking zone, rapid cooling section and mistake
Aging section.Each process section control parameter includes: one section 750 DEG C of heating, 10 DEG C/s of heating speed；800 DEG C of soaking zone, soaking
Time 300s；450 DEG C of slow cooling section outlet temperature, slow cooling section cooling velocity is 5 DEG C/s；Two sections 650 DEG C of heating, heating speed 10
℃/s；700 DEG C of soaking zone, soaking time 200s；100 DEG C of rapid cooling section outlet temperature, 50 DEG C/s of rapid cooling section cooling velocity；Overaging
350 DEG C of section.When described zinc-plated, cathode-current density 5A/dm, temperature is 30 DEG C, mixing speed 200r/min, is contained in plating solution
There is ZnO 10g/L, NaOH 100g/L and nano SiC granule are as reinforced phase.The high-strength steel sheet is by weight percentage
Meter, elemental composition include: C:0.005%, Si:0.20%, Mn:0.20%, Al:1.40%, Cr:0.10%, Ce:0.05%,
P≤0.010%, S≤0.010%, Ti:0.10%, Zr:0.10%, V:0.10%, Nb:0.10%, surplus are Fe and can not
The impurity avoided.In the course of hot rolling carried out before the heat treatment, first by heating steel billet to 1200 DEG C of heat preservation 1h, hot rolling open rolling
Temperature is 1150 DEG C, and with a thickness of 5mm after 6 passes, finishing temperature is 900 DEG C, is crimped at 700 DEG C, then pickling.It is described
In the smelting process carried out before hot rolling, first molten iron is pre-processed by pre- desulfurization, pre- dephosphorization, pre- decarburization, in converter smelting
Cooperate RH application of vacuum.The average grain diameter of the nano SiC granule is about 50nm.
Embodiment 2:
A kind of heat treatment method of high-strength steel sheet, which is characterized in that the yield strength of the high-strength steel sheet is
1400MPa, tensile strength are 1700 MPa.The heat treatment method includes continuous annealing and zinc-plated step；Wherein, described continuous
The process section successively carried out when annealing includes: one section of heating, soaking zone, slow cooling section, two sections of heating, soaking zone, rapid cooling section and mistake
Aging section.Each process section control parameter includes: one section 850 DEG C of heating, 15 DEG C/s of heating speed；900 DEG C of soaking zone, soaking
Time 500s；550 DEG C of slow cooling section outlet temperature, slow cooling section cooling velocity is 10 DEG C/s；Two sections 750 DEG C of heating, heating speed 15
℃/s；800 DEG C of soaking zone, soaking time 400s；200 DEG C of rapid cooling section outlet temperature, 100 DEG C/s of rapid cooling section cooling velocity；It is out-of-date
400 DEG C of section of effect.When described zinc-plated, cathode-current density 10A/dm, temperature is 50 DEG C, mixing speed 400r/min, plating solution
In contain ZnO 15g/L, NaOH 120g/L and nano SiC granule are as reinforced phase.The high-strength steel sheet by weight hundred
To divide than meter, elemental composition includes: C:0.003%, Si:0.35%, Mn:0.35%, Al:1.60%, Cr:0.50%,
Ce:0.10%, P≤0.010%, S≤0.010%, Ti:0.50%, surplus are Fe and inevitable impurity.At the heat
In the course of hot rolling carried out before reason, first by heating steel billet to 1250 DEG C of heat preservation 1h, hot rolling start rolling temperature is 1150 DEG C, through 6
With a thickness of 5mm after secondary rolling, finishing temperature is 920 DEG C, is crimped at 720 DEG C, then pickling.The smelting carried out before the hot rolling
In the process, first molten iron is pre-processed by pre- desulfurization, pre- dephosphorization, pre- decarburization, RH application of vacuum is cooperated in converter smelting.It is described
The average grain diameter of nano SiC granule is about 50nm.
Embodiment 3:
A kind of heat treatment method of high-strength steel sheet, which is characterized in that the yield strength of the high-strength steel sheet is
1500MPa, tensile strength are 1800 MPa；The heat treatment method includes continuous annealing and zinc-plated step.Wherein, described continuous
The process section successively carried out when annealing includes: one section of heating, soaking zone, slow cooling section, two sections of heating, soaking zone, rapid cooling section and mistake
Aging section.Each process section control parameter includes: one section 800 DEG C of heating, 12 DEG C/s of heating speed；850 DEG C of soaking zone, soaking
Time 400s；500 DEG C of slow cooling section outlet temperature, slow cooling section cooling velocity is 8 DEG C/s；Two sections 700 DEG C of heating, heating speed 12
℃/s；750 DEG C of soaking zone, soaking time 300s；150 DEG C of rapid cooling section outlet temperature, 80 DEG C/s of rapid cooling section cooling velocity；Overaging
380 DEG C of section.When described zinc-plated, cathode-current density 8A/dm, temperature is 40 DEG C, mixing speed 300r/min, is contained in plating solution
There is ZnO 12g/L, NaOH 110g/L and nano SiC granule are as reinforced phase.The high-strength steel sheet is by weight percentage
Meter, elemental composition include: C:0.004%, Si:0.30%, Mn:0.30%, Al:1.50%, Cr:0.30%, Ce:0.10%,
P≤0.010%, S≤0.010%, Ti:0.50%, V:0.10%, surplus are Fe and inevitable impurity.The heat treatment
In the course of hot rolling carried out before, first by heating steel billet to 1250 DEG C of heat preservation 1h, hot rolling start rolling temperature is 1150 DEG C, through 6 passages
With a thickness of 5mm after rolling, finishing temperature is 900 DEG C or more, is crimped at 700 DEG C or more, then pickling.It is carried out before the hot rolling
Smelting process in, first by molten iron by pre- desulfurization, pre- dephosphorization, pre- decarburization pre-process, in converter smelting cooperate RH vacuum at
Reason.The average grain diameter of the nano SiC granule is about 50nm.
Comparative example 1
By the steel plate with technical solution of the present invention same composition ingredient, progress and continuous annealing of the present invention and zincincation are not
With heat treatment when, the obtained steel plate of heat treatment mode in the prior art can not obtain intensity technique possessed by the present invention
Effect and corrosion resistance of surface, there are recrystallization crystal particle dimensions it is coarse, cleanliness is insufficient, production cost is higher the defects of, and it is most
Big yield strength and tensile strength are also unable to reach effect of the invention.
Comparative example 2
Elemental composition of the invention be will differ from as raw material, especially rare earth element or Ti, Zr, V, Nb equal size ratio
When change, cause recrystal grain coarse, the yield strength of obtained steel plate finished product is only 900MPa, and tensile strength is only
1000MPa。
The present invention passes through to continuous in high-strength steel sheet heat treatment method it can be seen from embodiment 1-3 and comparative example 1-2
Annealing, zinc-plated, melting, hot rolling and etc. optimization and steel plate alloying component adjustment, so that the crystal structure of alloy is changed,
The refinement for strengthening texture and recrystallized structure, to significantly improve the mechanical performance of steel plate.To each process section of continuous annealing
Parameter is finely controlled, and zinc-plated step be added nanometer reinforcing phase, optimize plating solution composition, make surface of steel plate performance obtain into
One step improves.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (4)
1. a kind of heat treatment method of high-strength steel sheet, which is characterized in that the yield strength of the high-strength steel sheet be 1300~
1500MPa, tensile strength are 1600~1800 MPa；The heat treatment method includes continuous annealing and zinc-plated step；Wherein, institute
The process section successively carried out when stating continuous annealing includes: one section of heating, soaking zone, slow cooling section, heating two sections, soaking zone, rapid cooling
Section and overaging section；
Each process section control parameter includes: one section 750~850 DEG C of heating, 10~15 DEG C/s of heating speed；Soaking zone 800
~900 DEG C, 300~500s of soaking time；450~550 DEG C of slow cooling section outlet temperature, slow cooling section cooling velocity is 5~10 DEG C/s；
Two sections 650~750 DEG C of heating, 10~15 DEG C/s of heating speed；700~800 DEG C of soaking zone, 200~400s of soaking time；Rapid cooling
100~200 DEG C of outlet temperature of section, 50~100 DEG C/s of rapid cooling section cooling velocity；350~400 DEG C of overaging section；
When described zinc-plated, cathode-current density is 5~10A/dm, and temperature is 30~50 DEG C, and mixing speed is 200~400r/
Min contains 10~15g/L of ZnO in plating solution, and 100~120g/L of NaOH and nano SiC granule are as reinforced phase；
By weight percentage, elemental composition includes: C≤0.005%, Si:0.20~0.35%, Mn to the high-strength steel sheet:
0.20~0.35%, Al:1.40~1.60%, Cr:0.10~0.50%, Ce:0.05~0.10%, P≤0.010%, S≤
0.010%, surplus is Fe and inevitable impurity；
In the course of hot rolling carried out before the heat treatment, first by heating steel billet to 1200~1250 DEG C of heat preservation 1h, hot rolling open rolling
Temperature is 1150 DEG C, and with a thickness of 5mm after 6 passes, finishing temperature is 900 DEG C or more, is crimped at 700 DEG C or more, then
Pickling.
2. heat treatment method according to claim 1, it is characterised in that: the high-strength steel sheet by weight percentage,
Its elemental composition further include: Ti:0.10~0.50% and/or Zr:0.10~0.50% and/or V:0.10~0.50% and/
Or Nb:0.10~0.50%.
3. heat treatment method according to claim 1 or 2, it is characterised in that: the smelting process carried out before the hot rolling
In, molten iron is pre-processed by pre- desulfurization, pre- dephosphorization, pre- decarburization first, RH application of vacuum is cooperated in converter smelting.
4. heat treatment method according to claim 3, it is characterised in that: the average grain diameter of the nano SiC granule is
50nm。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125472A (en) * | 2001-06-06 | 2008-02-20 | 新日本制铁株式会社 | Hot-dip galvanized thin steel sheet, thin steel sheet processed by hot-dip galvanized layer, and a method of producing the same |
| CN102304731A (en) * | 2011-08-23 | 2012-01-04 | 武汉吉和昌化工科技有限公司 | Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process |
| CN103703157A (en) * | 2011-07-29 | 2014-04-02 | 新日铁住金株式会社 | High-strength steel sheet having excellent shape-retaining properties, high-strength zinc-plated steel sheet, and method for manufacturing same |
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2017
- 2017-10-14 CN CN201710954779.4A patent/CN107641685B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125472A (en) * | 2001-06-06 | 2008-02-20 | 新日本制铁株式会社 | Hot-dip galvanized thin steel sheet, thin steel sheet processed by hot-dip galvanized layer, and a method of producing the same |
| CN103703157A (en) * | 2011-07-29 | 2014-04-02 | 新日铁住金株式会社 | High-strength steel sheet having excellent shape-retaining properties, high-strength zinc-plated steel sheet, and method for manufacturing same |
| CN102304731A (en) * | 2011-08-23 | 2012-01-04 | 武汉吉和昌化工科技有限公司 | Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process |
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